Steam-boiler.



No. 759,523. PATBNTED MAY 10, 1904. A. G. HOHENSTEIN. STEAM BOILER.

APPLICATION IILED JUNE 1. 1903. R0 MODEL. 3 SHEETS-SHEET 1.

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- A. G. HOHENSTEIN.

STEAM BOILER. APPLICATION IILBD JUNE 1. 1903.

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PATEN TED MAY 10, 1904,

A. G. HOHENSTEIN.

STEAM BOILER.

APPLICATION rum) JUNE 1. 1903.

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" UNITED STATES Patented May 10, 1904.

PATENT OFFICE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 759,523, dated May 10,1904,

Application filed June 1, 1903. Serial No. 159,689. (No model.)

To (LU 11/72/0111, it"ntcty concern:

Be it known thatI, ARCHIE GERRY I-Iouum s'rEIN, a citizen of the UnitedStates, residing at New Haven, in the county of New Haven and State ofConnecticut, have invented or discovered certain new and usefulImprovements in Steam-Boilers, of which improvements the following is aspecification.

The' invention described herein relates to certain improvements inwater-tube boilers, the invention being more especially directed to aconstruction whereby the boiler is adapted for the use of liquid fuel,as oil.

Generally stated, the invention consists in the provision within thelire-box of suitable combustion-chambers or arches formed of refractorymaterial in which the combustion of the oil occurs, the walls of thefire-box being formed in part by heatin '-surfaces, the arches beingdesigned to prevent direct impingement of the hottest flames with thewater-cooled tubes until complete combustion occurs.

The invention is hereinafter more fully described and claimed.

In the accompanying d awings, forming a part of this specification,Figure l is a front elevation of my improved boiler, a portion of thecasing being removed. Fig. 2 is a transverse sectional elevation of thesame; and Fig. 3 is a rear elevation, a portion of. the back casingbeing removed.

h In the practice of my invention the headers 1 are extended down to apoint below that at which the oil is introduced and are connected attheir lower ends to a distributing or equalizing box tube. The headersmay be formed in two vertical sections, as shown and described inapplication Serial No. 159,684, filed June 1, 1903, or dividedtransversely by a par tition 1. The lower water-chambers or headers areconnected to the front ends of a series of tubes 5, extending rearwardlyand connect ed to junction-boxes 6. The rear ends of two series of tubes7 and 8 are also connected to these junction-boxes and to the upperwaterchambers or portions of the headers, as described and shown inapplication Serial No. 159,684, filed June 1, 1903. This arrangement ofthe series of tubes 5, 7, and 8 may be re versed, as shown 1n theapplication referred to.- The upper ends of the headers are connected bya series of tubes 11 with the drum 12, which is also connected to theupper ends of the downtakes 13. These downtakes extend downwardly belowthe fire-chamber and may be either nippled together to equalizecirculation, as shown in Fig. 3, or connected to an equalizing box ordrum, as shownand described in application Serial No. 159,685,1iled Junc 1, 1903. 'Each of the downtalres is connected by a tube 9 with theequalizing box or.

chamber 39 at the front of the furnace, said tubes passing below thefire-chamber and forming a water-floor therefor. The outer or enddowntakes are connected by a series of tubes 20 with the outer or endheaders and are so arranged and connected to the headers and downtakesas to form water-walls at the sides of the boiler. formed ofrefractorymaterial, are arranged in a space between the tubes 5 and 9, forming aseries of combustion-ehambers, said arches resting upon blocks I9,hereinafter described, or, if preferred, directly upon the tubes.

As clearly shown in Figs. 1 and 3, the lower ends of the headers aredrawn in or flattened, so as to form spaces a through which can beinserted the burners 50, which project through the front casing. In casethe burners are not inserted through all the spaces between thelower-ends of the headers such unoccupied space can be covered by.pieccs of mica, so as to permit the 'liremen to inspect the flamewithin the fire-chamber.

The entrance of air between the tubes 9,

forming the water-floor, is prevented by. a

plate 51, which extends from the front of the furnace to a point nearthe downtakes, and the open space thus formed is adapted to be closed bya hinged section 52 of the fiooru A series of arches 18,

crease the heating-surfaces of these blocks. As the air flows up throughthe opening adjacent to the downtakes it will flow forward along thepassages in the blocks and the upper surfaces of the tubes 9, beinghighly heated both by the tubes and the blocks which are heated by theflame in the combustion-chambers.

It will be observed that in the construction shown the equalizing-boxand the water-floors are arranged a considerable distance above thefloor of the fire-room, so that there willbe a free flow of airtherethrough, keeping such floor cool, thereby permitting of the storageof the liquid fuel immediately below the boiler. In order to prevent thedowntakes from being injured by the direct impingement of the hot flamesfrom the combustion-chambers, their lower portions are covered byrefractory material, and the space between the downtakes and thejunction-boxes is closed by a supporting-wall 54:, also a form ofrefractory material.

It is characteristic of my improved boiler that the sides, ends, andbottom of the firebox are formed by Water-walls, the headers forming thefront wall, the tubes forming the side walls, the downtakes forming therear Wall, while the bottom of the fire box is formed by the tubes 9.The refractory arches are employed for insuring complete vaporizationand ignition of the gases before they come into contact withwater-cooled surfaces, thus preventing the formation of carbon.-

It will be observed that the headers, downtakes, side water-wall, andthe water-floor form portions of the complete loop circulationcharacteristic of my improved type of boiler.

I claim herein as my invention- 1. A water-tube boiler having incombination a lower series of water-chambers forming the front wall ofthe fire-box, an upper series of water-chambers, connected series oftubes extending from said chambers, and return connections from theupper to the lower series of water-chambers, substantially as set forth.

2. A water-tube boiler having in combination a lower series ofwater-chambers forming the front wall of the fire-box, an upper seriesof water-chambers, connected series of tubes extending from saidchambers, tubes extending from the lower water-chambers and forming thebottom of the fire-box, and connections from the upper series ofwater-chambers to said tubes, substantially as set forth.

3. A water-tube boiler having in combination headers arranged to formthe front of the fire-box, three connected series of tubes extendingfrom the headers, tubes extending from the upper portions of theheaders, downtakes having their upper ends connected to said tubes, andtubes extending forwardly from the downtakes and connected to theheaders, and forming a floor for the fire-box, substantially as setforth.

4:. A water-tube boiler having in combination headers arranged to formthe front of the fire-box, three connected series of tubes extendingfrom the headers, a drum connected to the upper portions of the headers,downtakes extending from the drum, and tubes extending from thedowntakes and connected to the headers and forming a water-floor for thefire-box, substantially as set forth.

5. A water-tube boiler having in combination a distributing orequalizing box, headers connected to said box and forming the front ofthe fire-box, three connected series of tubes extending from theheaders, a drum connected to the headers, downtakes, tubes extendingfrom the downtakes to the equalizing-box and forming a water-floor forthe fire-box, and tubes extending from the end downtakes to end headersand forming water-walls for the fire-box, substantially as set forth.

6. A water-tube boiler having a loop circulation having in combinationtherewith waterwalls forming the sides, ends and floor of the fire-boxand forming parts of the circulating system of the boiler, substantiallyas set forth.

7 A water-tube boiler having in combination therewith water-wallsforming the sides, ends and floor of the fire-box and forming parts ofthe circulating system of the boiler, substantially as set forth.

8. A water-tube boiler having in combina tion therewith a water-floorfor the fire-box and a series of arches or combustion-chambers supportedby said floor, substantially as set forth.

9. A water-tube boiler having in combination therewith a water-floorformed of a series of tubes included in the circulating system of theboiler, metal blocks having grooved under surfaces resting on said tubesand arches or combustion chambers supported by said blocks,substantially as set forth.

In testimony whereof I have hereunto set my hand.

ARCHIE G. HOHENSTEIN.

Witnesses:

DARWIN S. VVOLCOTT, J. C. DAvrDsoN.

